GHSA-h3v5-h239-pg29 Electron: Off-screen rendering on macOS trusts GPU-supplied frame geometry

• npm electron: < 42.11.6 → fixed in 42.11.6 • npm electron: >= 43.0.0-alpha.1, < 43.7.3 → fixed in 43.7.3 • npm electron: >= 44.0.0-alpha.1, < 44.4.3 → fixed in 44.4.3 • npm electron: >= 45.0.0-alpha.1, < 45.0.0-alpha.9 → fixed in 45.0.0-alpha.9

Impact In offscreen rendering mode on macOS, frame data received from the GPU process was not fully validated by the main process. A compromised GPU process could cause the main process to read out-of-bounds memory while producing `paint` event images, disclosing memory or crashing the app. GHSA-pfmc-3mgc-p6fp covers the same issue on the other capture paths. Apps are only affected if they use offscreen rendering (`webPreferences.offscreen`) on macOS and an attacker has separately gained code execution in the GPU process. Apps that do not use offscreen rendering are not affected. Workarounds There are no app side workarounds, you must update to a patched version of Electron. Fixed Versions • `45.0.0-alpha.9` • `44.4.3` • `43.7.3` • `42.11.6` For more information If you have any questions or comments about this advisory, email us at [email protected]